I've been doing this since the launch of the Japanese client.
I look for people who have _jp in their character or
@names or who I talk to and only respond with emotes, clearly not knowing what I'm saying. In fairness most of the things I say are pretty strange. I confront new players and ask them "are we friends now?" or hit them with flower petals and say, "now that we're married, we should also be friends" and then make them crafted armor sets or take them on adventures.
But for the Japanese players I try to find more and more, grouping them up, and then take them all over Tamriel, crafting them perhaps sets of all matching armor, or taking them to strange locations and the like, or simply help them complete content like Dolmens or world bosses, or sometimes we explore Cyrodiil.
Since I do not know Japanese and they do not know English I use Google Translate. But what I type into Translate is not "Hello! Let us adventure together!" or something mundane like that. I only type in surreal nonsense like "If every duck were colored blue we couldn't be expected to collect enough bees for a party" or "The time I most like to snuggle is furtive armoire." I have no idea how that comes across once translated. I do not care.
Not one single person has ever turned down my friend request after these adventures.
This is
by far the most fun activity I've dreamt up.
As a parting gift I will say the second most fun is "house-surfing to spy on RP guilds" I look at guild or group lists and if I see someone in a named Home I will port to them. Sometimes this is
not their house, but something like an RP guild hall. I then stealth up (they can see me, obviously, but they have to pretend they cannot, see?) and observe whatever it is they're up to. Strangely, although sometimes one person will come stand near me and look at me no one has actually ever spoken to me or asked me why I'm there whilst spying on their RP. Not sure why.